WO2014185307A1 - 摩擦材及びドラムブレーキ用摩擦材 - Google Patents
摩擦材及びドラムブレーキ用摩擦材 Download PDFInfo
- Publication number
- WO2014185307A1 WO2014185307A1 PCT/JP2014/062225 JP2014062225W WO2014185307A1 WO 2014185307 A1 WO2014185307 A1 WO 2014185307A1 JP 2014062225 W JP2014062225 W JP 2014062225W WO 2014185307 A1 WO2014185307 A1 WO 2014185307A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- friction material
- titanate compound
- friction
- binder
- titanate
- Prior art date
Links
- 239000002783 friction material Substances 0.000 title claims abstract description 69
- -1 titanate compound Chemical class 0.000 claims abstract description 41
- 239000011230 binding agent Substances 0.000 claims description 18
- 239000003513 alkali Substances 0.000 claims description 15
- 238000010828 elution Methods 0.000 claims description 14
- 239000012784 inorganic fiber Substances 0.000 claims description 10
- 239000005011 phenolic resin Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 9
- 238000005299 abrasion Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 239000002245 particle Substances 0.000 description 14
- 239000006185 dispersion Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical class [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 7
- 229910052783 alkali metal Inorganic materials 0.000 description 7
- 150000001340 alkali metals Chemical class 0.000 description 7
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- 150000001342 alkaline earth metals Chemical class 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 239000011490 mineral wool Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 238000005562 fading Methods 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000003607 modifier Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- SWHAQEYMVUEVNF-UHFFFAOYSA-N magnesium potassium Chemical compound [Mg].[K] SWHAQEYMVUEVNF-UHFFFAOYSA-N 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- HNSDLXPSAYFUHK-UHFFFAOYSA-N 1,4-bis(2-ethylhexyl) sulfosuccinate Chemical compound CCCCC(CC)COC(=O)CC(S(O)(=O)=O)C(=O)OCC(CC)CCCC HNSDLXPSAYFUHK-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229920001342 Bakelite® Polymers 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229940126062 Compound A Drugs 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- JNGZXGGOCLZBFB-IVCQMTBJSA-N compound E Chemical compound N([C@@H](C)C(=O)N[C@@H]1C(N(C)C2=CC=CC=C2C(C=2C=CC=CC=2)=N1)=O)C(=O)CC1=CC(F)=CC(F)=C1 JNGZXGGOCLZBFB-IVCQMTBJSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910052730 francium Inorganic materials 0.000 description 1
- KLMCZVJOEAUDNE-UHFFFAOYSA-N francium atom Chemical compound [Fr] KLMCZVJOEAUDNE-UHFFFAOYSA-N 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- OBTSLRFPKIKXSZ-UHFFFAOYSA-N lithium potassium Chemical compound [Li].[K] OBTSLRFPKIKXSZ-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- ZDHURYWHEBEGHO-UHFFFAOYSA-N potassiopotassium Chemical compound [K].[K] ZDHURYWHEBEGHO-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- LVTJOONKWUXEFR-FZRMHRINSA-N protoneodioscin Natural products O(C[C@@H](CC[C@]1(O)[C@H](C)[C@@H]2[C@]3(C)[C@H]([C@H]4[C@@H]([C@]5(C)C(=CC4)C[C@@H](O[C@@H]4[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@@H](O)[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@H](CO)O4)CC5)CC3)C[C@@H]2O1)C)[C@H]1[C@H](O)[C@H](O)[C@H](O)[C@@H](CO)O1 LVTJOONKWUXEFR-FZRMHRINSA-N 0.000 description 1
- 229910052705 radium Inorganic materials 0.000 description 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/025—Compositions based on an organic binder
- F16D69/026—Compositions based on an organic binder containing fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0039—Ceramics
- F16D2200/0043—Ceramic base, e.g. metal oxides or ceramic binder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/006—Materials; Production methods therefor containing fibres or particles
- F16D2200/0065—Inorganic, e.g. non-asbestos mineral fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
- F16D2200/0086—Moulding materials together by application of heat and pressure
Definitions
- the present invention relates to a friction material and a friction material for a drum brake.
- Friction materials used in brake systems for various vehicles and industrial machines are required to have excellent wear resistance and a high coefficient of friction and stability.
- a friction material made of a friction adjusting material, a lubricant, a filler, and the like and a binder resin (binding material) for bonding them is used.
- the drum brake has a problem that heat dissipation is poor due to a sealed structure, and fading is likely to occur. It is considered that the fade phenomenon occurs when an organic component in the friction material is decomposed to generate a gas, and the gas is interposed between the friction material and the drum.
- Patent Document 1 discloses that the fade phenomenon can be suppressed by adding iron oxide or potassium titanate having an average particle size of 3.5 ⁇ m or more, but the fade phenomenon of the friction material containing a large amount of binder is suppressed. No means to do so has been proposed. Since the friction material of the drum brake has an arc shape, it is necessary to increase the amount of the binder to maintain the strength of the friction material.
- the drum brake is able to generate a braking force larger than the input because the force pulled into the drum is generated by pressing a brake shoe with a friction material called a lining from the inside of the rotating drum. effect).
- the larger the friction coefficient of the friction material the greater the self-servo effect.
- the friction coefficient varies depending on the use environment, the variation is amplified by the self-servo effect, so that precise adjustment of the braking force becomes difficult.
- An object of the present invention is to provide a friction material having excellent fade characteristics and wear resistance and a friction material for a drum brake.
- the present invention provides the following friction materials and friction materials for drum brakes.
- Item 1 A friction material containing a titanate compound and a binder, wherein the titanate compound is contained in an amount of 1 to 22% by volume of the entire friction material, and the binder is 18 volumes of the entire friction material.
- Item 2 The friction material according to Item 1, which is a friction material for a drum brake.
- Item 4 The friction material according to any one of Items 1 to 3, further comprising inorganic fibers.
- Item 5 The friction material according to any one of Items 1 to 4, wherein the binder is a phenol resin.
- Item 6 The friction material according to any one of Items 1 to 5, wherein the alkali elution rate of the titanate compound is 15% by mass or less.
- the friction material and drum brake friction material of the present invention have excellent fade characteristics and wear resistance.
- the friction material of the present invention is a friction material containing a titanate compound and a binding material, wherein the titanate compound is contained in an amount of 1 to 22% by volume of the entire friction material, and the binding material is the entire friction material. It is characterized by containing 18 volume% or more.
- the content of titanate compound may be 1 to 22% by volume of the entire friction material, preferably 2 to 15% by volume, more preferably 2 to 10% by volume.
- the content of the titanate compound is more than 22% by volume, a reverse fade phenomenon in which the friction coefficient increases is not preferable. It is presumed that this occurs because the organic component decomposes and the amount of the inorganic component exposed to the friction surface increases.
- the content of the titanate compound is less than 1% by volume, it is not preferable because sufficient abrasion resistance cannot be obtained.
- the alkali elution rate of the titanate compound may be 15% by mass or less, preferably 0.1 to 15% by mass, more preferably 0.1 to 10% by mass, and further preferably 0.1 to 6% by mass. is there.
- the fade phenomenon can be suppressed and the wear resistance can be improved. It is presumed that the alkali component generated by the abrasion destruction of the titanate compound acts on the decomposition gas of the organic component and the generation of a transfer film (transfer film).
- the titanate compound used in the present invention preferably has a water dispersion pH of 7 to 11, more preferably 8 to 10, and still more preferably 9 to 10.
- aqueous dispersion pH of the titanate compound By setting the aqueous dispersion pH of the titanate compound within such a range, it is possible to suppress a decrease in friction characteristics due to acidic impurities contained in the titanate compound.
- the alkali elution rate means the mass ratio of alkali metal and alkaline earth metal eluted from the titanate compound into water at 80 ° C. in water.
- the alkali elution rate can be measured by, for example, an ion chromatograph.
- water dispersion pH means the pH of the slurry obtained by disperse
- the titanate compound used in the present invention is preferably a salt of at least one element selected from the group of alkali metals and alkaline earth metals.
- alkali metal include lithium, sodium, potassium, rubidium, cesium, and francium, and lithium, sodium, and potassium are preferable.
- alkaline earth metal include beryllium, magnesium, calcium, strontium, barium, and radium, preferably magnesium and calcium.
- titanate compounds include alkali metal titanates represented by the general formula M 2 O ⁇ nTiO 2 (wherein M is one or more of alkali metals, and n is a number of 4 to 11), An alkaline earth metal titanate represented by the general formula RO ⁇ TiO 2 (wherein R is one or more of alkaline earth metals), a general formula M x A y Ti 2-y O 4 (wherein , M is an alkali metal excluding lithium, A is one or more selected from lithium, magnesium, zinc, nickel, copper, iron, aluminum, gallium, and manganese, x is 0.5 to 1.0, and y is A titanate compound represented by the general formula K 0.5 to 0.8 Li 0.27 Ti 1.73 O 3.85 to 4 lithium potassium acid of the general formula K 0.2 ⁇ .8 Mg 0.4 Ti 1.6 O 3.7 can be cited lepidocrocite type titanate magnesium potassium represented by 1-4.
- M alkali metal titanates represented by the general formula M 2 O ⁇ nTi
- a titanate compound having a tunnel structure in the crystal structure is preferable, and specifically, Na 2 Ti 6 O 13 , Na 2 Ti 8 O 17 , K 2 Ti 6 O 13 , K 2 Ti 8 O 17 , Li 4 Ti 5 O 12, can be cited CaTiO 3, MgTiO 3, or the like.
- a tunnel structure alkali elution from the titanate compound can be suppressed.
- the titanate compound has non-fibrous particles such as fibrous, spherical, layered, plate-like, columnar, block-like, and irregular shapes, but is non-fibrous from the viewpoint of improving the working environment and frictional wear characteristics.
- the average particle size is preferably from 0.1 to 50 ⁇ m, more preferably from 1 to 50 ⁇ m, still more preferably from 1 to 20 ⁇ m.
- the average particle size means a particle size having an integrated value of 50% in the particle size distribution determined by the laser diffraction / scattering method.
- thermosetting resins such as phenol resin, formaldehyde resin, melamine resin, epoxy resin, acrylic resin, aromatic polyester resin, urea resin can be mentioned, and one of these is used alone or in combination of two or more. be able to. Among these, a phenol resin is preferable.
- the blending amount of the binder may be 18% by volume or more, preferably 19% by volume or more, and more preferably 20% by volume or more with respect to the entire friction material.
- the upper limit of the amount is preferably 40% by volume, more preferably 30% by volume, and still more preferably 25%. If the amount of the binder is small, it is not preferable because sufficient wear resistance cannot be obtained.
- the friction material of the present invention preferably further contains inorganic fibers.
- the blending amount of the inorganic fibers is preferably 1 to 20% by volume, and more preferably 5 to 15% by volume with respect to the entire friction material.
- the combined use of inorganic fibers and a titanate compound serves to further improve the fade characteristics and wear resistance.
- the inorganic fibers preferably have an average fiber diameter of 0.1 to 10 ⁇ m and an average fiber length of 100 to 800 ⁇ m.
- inorganic fiber used in the present invention an arbitrary one can be appropriately selected from known inorganic fibers used in the friction material.
- rock wool, wollastonite fiber, Al 2 O 3 —SiO 2 ceramic fiber, biosoluble ceramic fiber, glass fiber, carbon fiber and the like can be mentioned, one of these alone or two or more Can be used in combination.
- rock wool is preferable.
- one or two or more additives that are conventionally used as friction modifiers can be blended in the friction material, as long as the preferable physical properties are not impaired.
- friction modifiers include abrasives, lubricants, organic dust, metals, fillers, and the like. These can be blended according to the friction characteristics required for the product, for example, the coefficient of friction, wear resistance, vibration characteristics, squeal characteristics, and the like.
- the above-mentioned binder, titanate compound, and a mixture of inorganic fibers, friction modifiers, etc. are molded at room temperature and at a predetermined pressure, and then predetermined.
- the molded body of friction material can be finished by thermoforming at a temperature, heat treatment and finishing treatment.
- the friction material of the present invention can be used for disc brakes, drum brakes and the like.
- it can be suitably used for a drum brake in which the fluctuation of the friction coefficient is amplified by the self-servo effect and the fade phenomenon is likely to occur.
- Specific examples of the drum brake include a leading / trailing type, a two leading type, a duo touring type, a duo servo type and the like.
- the following titanate compounds were used in Examples and Comparative Examples.
- the alkali elution rate and water dispersion pH were measured according to the following methods.
- composition potassium potassium titanate (compositional formula K 2 O ⁇ 8TiO 2 ), particle shape: plate shape, average particle size: 8 ⁇ m, alkali elution rate: 0.2 mass%, water dispersion pH: 9.4
- composition Potassium magnesium titanate (compositional formula K 0.7 Mg 0.4 Ti 1.6 O 3.95 ), particle shape: plate shape, average particle size: 4 ⁇ m, alkali elution rate: 5.3 mass%, water Dispersion pH: 11
- composition potassium titanate (compositional formula K 2 O ⁇ 6TiO 2 ), particle shape: plate shape, average particle size: 27 ⁇ m, alkali elution rate: 0.2 mass%, water dispersion pH: 9.2
- Composition potassium titanate (compositional formula K 2 O ⁇ 6TiO 2 ), particle shape: columnar, average length: 2.0
- the friction test was performed in accordance with JASO C406: 2000 using a scale dynamometer, the rotor was 110 mm cast iron (carbon content 3.3%), and the inertia was a 2t-25t truck drum brake friction material.
- the absorption energy per unit area was set to 1200 J / cm 2 (initial speed 100 km / h).
- the friction coefficient at the time of 2 nd fade test was measured, showing an initial friction coefficient, minimum coefficient of friction, the fade rate in Table 1.
- the fade rate is calculated based on the formula [minimum coefficient of friction / coefficient of friction immediately before lowering] ⁇ 100, and the fade rate of Comparative Example 2 in which the reverse fading phenomenon is observed is expressed by the formula [final friction coefficient / initial friction coefficient] ⁇ 100.
- Rock wool in the table is rock wool having a fiber length of 125 ⁇ m (manufactured by Lapinus, RB295-Roxul 1000), and “phenol resin” is a novolac type phenol resin (manufactured by Sumitomo Bakelite, PR-51510). .
- the friction materials of Examples 1 to 8 according to the present invention have excellent fade characteristics and wear resistance as compared with the friction material of Comparative Example 1. It can be seen that the friction material of Comparative Example 2 containing more titanate compound than the range of the present invention has a high fade rate and a low fade characteristic. Moreover, it turns out that abrasion resistance further improves by containing the rock wool which is an inorganic fiber from the comparison with Example 2 and Example 8. FIG.
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Abstract
Description
組成:8チタン酸カリウム(組成式K2O・8TiO2)、粒子形状:板状、平均粒子径:8μm、アルカリ溶出率:0.2質量%、水分散pH:9.4
(チタン酸塩化合物B)
組成:チタン酸マグネシウムカリウム(組成式K0.7Mg0.4Ti1.6O3.95)、粒子形状:板状、平均粒子径:4μm、アルカリ溶出率:5.3質量%、水分散pH:11
(チタン酸塩化合物C)
組成:6チタン酸カリウム(組成式K2O・6TiO2)、粒子形状:板状、平均粒子径:27μm、アルカリ溶出率:0.2質量%、水分散pH:9.2
(チタン酸塩化合物D)
組成:6チタン酸カリウム(組成式K2O・6TiO2)、粒子形状:柱状、平均長:2.0μm、平均径:0.4μm、アルカリ溶出率:0.2質量%、水分散pH:9.5
(チタン酸塩化合物E)
組成:6チタン酸カリウム(組成式K2O・6TiO2)、粒子形状:繊維状、平均長:13μm、平均径:0.4μm、アルカリ溶出率:0.1質量%、水分散pH:7.0
チタン酸塩化合物の質量(X)を測定し、次いで該チタン酸塩化合物を蒸留水に加えて1質量%のスラリーを調製し、80℃で4時間撹拌後、ポアサイズ0.2μmのメンブレンフィルターで固形分を除去し、抽出液を得た。得られた抽出液のアルカリ金属とアルカリ土類金属の総質量(Y)をイオンクロマトグラフ(ダイオネクス社製、ICS-1100)にて測定した。次いで、前記質量(X)及び(Y)の値を用い、式[(Y)/(X)]×100に基づいて、アルカリ溶出率を算出した。
チタン酸塩化合物1gを蒸留水100mLに加えて1質量%のスラリーを調製し、得られたスラリーのpH(温度20℃)をpHメーター(堀場製作所社製、F21)にて測定し、水分散pHとした。
(実施例1~実施例8、比較例1~比較例2)
表1に示す組成で各種材料を配合し、レーディゲミキサーにて混合後、得られた混合物を仮成型(10MPa)、熱成形(150℃、20MPa)を行い、さらに熱処理(210℃)を行い、摩擦材を製造した。摩擦材を面積5.5cm2の扇型のテストピースに加工し、得られたテストピースの摩擦試験を行った。
Claims (6)
- チタン酸塩化合物と、結合材とを含有した摩擦材であって、前記チタン酸塩化合物が摩擦材全体の1~22体積%含有されており、前記結合材が摩擦材全体の18体積%以上含有されていることを特徴とする摩擦材。
- ドラムブレーキ用摩擦材であることを特徴とする請求項1に記載の摩擦材。
- チタン酸塩化合物と結合材との体積比が、チタン酸塩化合物:結合材=0.1:1~1:1であることを特徴とする請求項1または2に記載の摩擦材。
- さらに無機繊維を含有していることを特徴とする請求項1~3のいずれか一項に記載の摩擦材。
- 前記結合材が、フェノール樹脂であることを特徴とする請求項1~4のいずれか一項に記載の摩擦材。
- 前記チタン酸塩化合物のアルカリ溶出率が、15質量%以下であることを特徴とする請求項1~5のいずれか一項に記載の摩擦材。
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WO2017183439A1 (ja) * | 2016-04-19 | 2017-10-26 | 日清紡ブレーキ株式会社 | 摩擦材 |
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JP2016160299A (ja) * | 2015-02-27 | 2016-09-05 | 株式会社アドヴィックス | 非石綿系摩擦材 |
JP6514039B2 (ja) * | 2015-06-01 | 2019-05-15 | 大塚化学株式会社 | 樹脂組成物、これを用いた摩擦材及び摩擦部材 |
US10233988B2 (en) | 2015-09-23 | 2019-03-19 | Akebono Brake Industry Co., Ltd | Friction material |
JP2017101772A (ja) * | 2015-12-03 | 2017-06-08 | 日本バルカー工業株式会社 | グランドパッキン |
JP2017160402A (ja) * | 2016-03-11 | 2017-09-14 | 株式会社エコ・アール | 摩擦材 |
JP6713392B2 (ja) * | 2016-09-28 | 2020-06-24 | 大塚化学株式会社 | 樹脂組成物、これを用いた摩擦材、摩擦部材、及びドラムブレーキ用ブレーキシュー |
KR102237886B1 (ko) * | 2017-03-08 | 2021-04-07 | 오츠카 가가쿠 가부시키가이샤 | 마찰재 조성물, 마찰재 및 마찰 부재 |
CN111561530A (zh) * | 2020-04-23 | 2020-08-21 | 浙江万赛汽车零部件股份有限公司 | 一种高温500度耐磨型刹车片及其制备方法 |
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US20160108982A1 (en) | 2016-04-21 |
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